How would you prepare to ride 144 miles with 17,200' of elevation gain in under 10 hours and in 95F heat?

My typical early/late season TSS is between 300 and 400 a week. It goes up to 500-600 a week in the summer. I’m coming off a month of 200 TSS weeks and plan to increase that to 300 TSS/wk this month and 400 TSS/wk in Nov. I chose low volume for the traditional build because I love running in the fall and winter and want to have time to enjoy that too.

I plan on incorporating outdoor rides on the weekends starting in April. Some weekends that may be a fast group ride and others it may mean low intensity. The rides will typically be 3 to 5 hours long. Thanks for your input.